Well Pattern Optimization of Producing Remaining Oil on the Top of Meandering River Point Bar Sandbodies Using ASP Flooding

Xingbei development area of Daqing Oilfield is in high water cut period and its remaining oil distribution of meandering river reservoir is scattered and complex. Test wells data shows that within the river channel sand body reservoir, there still exists relative enrichment of remaining oil due to the interbed block, meanwhile channel sand body has relatively large thickness, of which the water washing degree is more serious, and the top still exists relative enrichment of remaining oil affected by water injection gravity. Field test of ASP flooding in Daqing Oilfield shows that ASP flooding has preferable effect on the major reservoirs. According to the practical conditions of Xing-6 east areaⅠblock in Daqing Oilfield, ASP flooding of different well patterns are studied and their displacement characteristics, development effect and remaining oil distribution regularity are proposed, which can provide guidance for producing remaining oil of meandering river point bar sand bodies in high water cut period. The results indicate that well pattern with horizontal injector and horizontal producer can enlarge oil layer drainage area and increase oil displacement efficiency of ASP flooding greatly, and ASP flooding with horizontal well can effectively produce remaining oil on the top of point bar sand body at late high water cut stage, which increases recovery efficiency with 7.33% compared with ASP flooding on vertical well.